Newly famous mayor still has city to lead

Lisa Krantz/San Antonio Express-News

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Diane Sawyer jokes with Julian Castro as he gets a little makeup for her interview with him for ABC World News at the Nascar Hall of Fame before the start of the Democratic National Convention in Charlotte, NC on Tuesday, Sept. 4, 2012.

Diane Sawyer jokes with Julian Castro as he gets a little makeup for her interview with him for ABC World News at the Nascar Hall of Fame before the start of the Democratic National Convention in Charlotte, NC on Tuesday, Sept. 4, 2012.